Where should I start?
First of all, I got the game. I tried to get the image file. Then I saw this. https://zenhax.com/viewtopic.php?p=22488#p22488
When I tried bms, I got the same result The dump.dat generated from image_info.psb.m is correct, The image_body.bin output is wrong. I got the same list of files. I don't know. https://mega.nz/#!aLJCXIhQ!5MqkR0r-3BK56vTNHu9Vjfzw7b_H2Cvas4XPzUwf24I
It's not going to solve my problem. And then I found this https://forums.fuwanovel.net/topic/20846-new-game-the-challenge-stage-files-and-elf/?tab=comments#comment-492110
But his link failed. I know exm2lib this tool. But his keys are incorrect. http://asmodean.reverse.net/pages/exm2lib.html
When I was very depressed, I wondered if I could use improper means. So I used hex to modify the key. https://mega.nz/#!TCJX3KAI!sI9qne70XUUnDgQwpWiXIOqZv5oD-8YVm5zSCXSzLUw https://mega.nz/#!KSYhQKSZ!I2oVn0wp6jdlUV42tmgfnRDbj7b-TjAUcTHXtDo1gf4
He succeeded in exporting images！ https://mega.nz/#!rGxxAIJT!5e99Ul803hPQdDBjmrZiS6FKrDQQz8nzBnH4KBgWIBY
But his color is a little strange and I don't know how to get the key. everyway I created this article as a backup. Maybe he can help people in the same dilemma. Who knows? Finally, please forgive my English.